MODEL 1073A
DISTRIBUTION AMPLIFIER
OPERATION MANUAL
Arbiter Systems, Inc.
Paso Robles, CA 93446
U.S.A.
www.arbiter.com
ii
Description
This manual is issued for reference only, at the convenience of Arbiter Systems. Reasonable effort
was made to verify that all contents were accurate as of the time of publication. Check with Arbiter
Systems at the address below for any revisions made since the original date of publication.
Contact Information
Arbiter Systems, Inc.
1324 Vendels Circle, Suite 121
Paso Robles, CA 93446
USA
(805) 237-3831
Website: www.arbiter.com
mailto:techsupport@arbiter.com
mailto:sales@arbiter.com
What This Manual Covers
This manual describes the set up and operation of the Model 1073A Distribution Amplifier.
iii
LIMITED WARRANTY
Arbiter Systems makes no warranty, expressed or implied, on any product manufactured or sold
by Arbiter Systems except for the following limited warranty against defects in materials and
workmanship on products manufactured by Arbiter Systems.
Products manufactured by Arbiter Systems are guaranteed against defective materials and workmanship under normal use and service from the date of delivery for one year. The responsibility
of Arbiter Systems under this warranty is limited to repair or replacement, at Arbiter Systems’
option, of any product found to be defective. Arbiter Systems shall have no liability under this
warranty unless it receives written notice of any claimed defect within the earlier of:
• Thirty days of discovery by Buyer, or;
• One year from the date of delivery.
For warranty service or repair, products must be returned to a service facility designated by Arbiter
Systems. Buyer shall prepay all shipping charges to Arbiter Systems, and Arbiter Systems shall pay
shipping charges incurred in returning the product to Buyer. However, Buyer shall pay all shipping
charges, duties and taxes for products returned to Buyer in a country other than the United States
of America.
THE WARRANTY SET FORTH HEREIN CONSTITUTES THE ONLY WARRANTY OBLIGATIONS OF ARBITER SYSTEMS, EXPRESSED OR IMPLIED, STATUTORY, BY OPERATION
OF LAW, OR OTHERWISE. ARBITER SYSTEMS DISCLAIMS ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, AND BUYER EXPRESSLY
WAIVES ALL OTHER WARRANTIES.
This limited warranty does not extend to any product, which has been subject to
1. Improper use or application, abuse, or operation beyond its rated capacity, or contrary to the
instructions in the operation and maintenance manuals (if any);
2. Accident;
3. Repair or maintenance performed by Buyer, except in accordance with the operation and
maintenance manuals, if any, and any special instructions of Arbiter Systems;
4. Modification without the prior written authorization of Arbiter Systems (whether by the
substitution of non-approved parts or otherwise). The remedies provided herein are Buyer’s
sole and exclusive remedies. In no event shall Arbiter Systems be liable for direct, indirect,
incidental or consequential damages (including loss of profits), whether based on contract,
tort, or other legal theory.
FOR THE FASTEST POSSIBLE SERVICE, PLEASE PROCEED AS FOLLOWS:
1. Notify Arbiter Systems, Inc., specifying the instrument model number and serial number and
giving full details of the difficulty. Service data or instrument-return authorization will be
provided upon receipt of this information.
2. If instrument return is authorized, forward prepaid to the manufacturer. If it is determined
that the instrument is not covered by this warranty, an estimate will be made before the
repair work begins, if requested.
See Contact Information on page ii.
iv
v
Model 1073A
Distribution Amplifier
Operation Manual
Table of Contents
Section 1
General Information
Section 2
Technical Specifications & Operational Parameters
Section 3
Physical Configuration
Section 4
Operation
Appendix A
Conformity with European Union Directives (CE Mark)
Index
Copyright Arbiter Systems Incorporated November 2014. All rights reserved. International copyright secured.
PD0022300G
vi
Contents
1 General Information
1.1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Equipment Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3.1 Option 01, Fiber Optic Input for Channel A . . . . . . . . . . . . .
1.3.2 Option 04, On/Off Switch . . . . . . . . . . . . . . . . . . . . . . .
1.3.3 Option 07, IEC-320 Power Inlet, 85 – 264 Vac, 110 – 275 Vdc . . .
1.3.4 Option 08, 10 – 60 Vdc Terminal Power Strip, Surge Withstand .
1.3.5 Option 10, 110 – 275 Vdc, Terminal Power Strip, Surge Withstand
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1
2
2
2
2
2
2
2 Technical Specifications & Operational Parameters
2.1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Operator Interface . . . . . . . . . . . . . . . . . . .
2.3 System Interface . . . . . . . . . . . . . . . . . . . .
2.3.1 Configuration . . . . . . . . . . . . . . . . . .
2.3.2 Operating Modes . . . . . . . . . . . . . . . .
2.3.3 Input Connectors . . . . . . . . . . . . . . . .
2.3.4 Output Connectors . . . . . . . . . . . . . . .
2.4 Physical Characteristics . . . . . . . . . . . . . . . .
2.4.1 Dimensions . . . . . . . . . . . . . . . . . . .
2.4.2 Weight . . . . . . . . . . . . . . . . . . . . . .
2.4.3 Power Requirements . . . . . . . . . . . . . .
2.4.4 Temperature . . . . . . . . . . . . . . . . . .
2.4.5 Electro-Magnetic Interference (EMI) . . . . .
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3
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3
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4
4
5
5
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5
5
3 Physical Configuration
3.1 Instrument . . . . . . . . . . . . .
3.1.1 Location Considerations . .
3.1.2 Power Requirements . . . .
3.1.3 Power Line Connection . .
3.1.4 Rear-Panel Layout . . . . .
3.2 Rack Mounting . . . . . . . . . . .
3.3 Cover Removal . . . . . . . . . . .
3.4 Jumper Configuration . . . . . . .
3.4.1 AC/DC Coupling of Inputs
3.4.2 Input Bussing . . . . . . . .
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viii
CONTENTS
3.5
3.4.3
3.4.4
3.4.5
Fiber
3.5.1
Input Characteristics . . . . .
AC/DC Coupling of Outputs
Output Characteristics . . . .
Optic Input (Option 01) . . .
Optical Input Characteristics
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4 Operation
4.1 Front Panel Controls and Indicators . . . .
4.1.1 LED Status Indicators . . . . . . . .
4.1.2 Front Panel Line Switch (Option 04)
4.2 Operator Control Functions . . . . . . . . .
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11
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15
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15
A CE Mark Certification
17
A.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
List of Figures
3.1
3.2
Model 1073A Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Model 1073A Main Board Jumper Locations . . . . . . . . . . . . . . . . . . . . . . 14
4.1
Model 1073A Distribution Amplifier, Front Panel . . . . . . . . . . . . . . . . . . . . 15
x
LIST OF FIGURES
List of Tables
1.1
Available IEC-320 Cordsets by Country . . . . . . . . . . . . . . . . . . . . . . . . .
3.1
3.2
3.3
3.4
Input Coupling Jumper List . . .
Channel B Input Selection Guide
Channel C Input Selection Guide
Output Jumper List . . . . . . .
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2
10
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xii
LIST OF TABLES
Chapter 1
General Information
1.1
Scope
This manual describes Model 1073A Distribution Amplifier.
This manual is divided into four chapters and one appendix as follows:
1.2
Chapter 1
General Information
Chapter 2
Technical Specifications and Operational Parameters
Chapter 3
Physical Configuration and Installation
Chapter 4
Operation
Appendix A
CE Mark
Equipment Supplied
The Model 1073A uses detachable connectors for Power and all Input/Output connections. The
following components are provided with the Model 1073A.
Main Power Module: The Model 1073A configuration includes a user specified power input
module. The three available options are:
Option 07:
85 – 264 Vac, 47 – 440 Hz or 110 – 270 Vdc, 3 VA, IEC-320 type power
input module, with an IEC-320 cordset.
Option 08:
10 – 60 Vdc, 3 W typical, power module with surge withstand capability
(SWC) using a 3-pole terminal strip for power inlet.
Option 10:
85 – 264 Vac, 47 – 440 Hz or 110 – 270 Vdc, 3 VA typical, power module
with SWC using a 3-pole terminal strip for power inlet.
Refer to paragraph 1.3 for a detailed description of each power module option.
Rack-Mount Ears (P/N: HD0034900): Two identical rack mounting ears are provided to
mount the instrument in an EIA standard 483 mm (19 inch) rack.
Self-Adhesive Rubber Feet (HP0006600): For bench-top applications, four self-adhesive rubber feet are included.
2
1.3
General Information
Options
The Model 1073A allows for installation of options, which can enhance various aspects of performance and features. The following is a list of available options.
1.3.1
Option 01, Fiber Optic Input for Channel A
Provides a fiber-optic input (parallel to channel A BNC input) with ST connector and 820-nm receiver compatible with multimode fiber (62.5/125 µm2 , also usable with 50/125 µm2 , 100/140 µm2 ,
and 200 µm2 ). Accepts -25.4 to -9.2 dBm for +5V logic level and <-40 dBm for 0 V logic level for
dc to 5 MHz.
1.3.2
Option 04, On/Off Switch
Provides a line switch on the front panel.
1.3.3
Option 07, IEC-320 Power Inlet, 85 – 264 Vac, 110 – 275 Vdc
Provides an AC/DC power module which includes an IEC-320 type inlet and mating cordset. Input
voltages are: 85 – 264 Vac, 47 – 440 Hz or 110 – 270 Vdc, 3 VA typical. Various cord sets, by
country, are available as Options P01 through P10 as seen in Table 1.1 below.
No.
Country
Specification
Rating
P01
P02
P03
P04
P05
P06
P07
P08
P09
P10
Continental Europe
Australia, NZ, PRC
U.K.
Denmark
India
Israel
Italy
Switzerland
North America and ROC
Japan
CEE 7/7
AS3112-1981
BS 1363
Afsnit 107-2-01
BS 546
SI 32
CEI 23-16/VII 1971
SEV 1011.1959
NEMA 5-15P CSA C22.2#42
JIS8303
220V
240V
240V
240V
220V
220V
220V
220V
120V
120V
Table 1.1: Available IEC-320 Cordsets by Country
1.3.4
Option 08, 10 – 60 Vdc Terminal Power Strip, Surge Withstand
Provides input surge protection (SWC) for compliance with ANSI C37.90-1 and IEC 801-4. Input
voltages are: 10 – 60 Vdc, 3 W typical. Utilizes a 3-pole terminal strip for power inlet.
1.3.5
Option 10, 110 – 275 Vdc, Terminal Power Strip, Surge Withstand
Provides input surge protection for compliance with ANSI C37.90-1 and IEC 801-4. Input voltages
are: 85 – 264 Vac, 47 – 440 Hz, or 110 – 270 Vdc, 3 VA typical. Utilizes a 3-pole terminal strip for
power inlet.
Chapter 2
Technical Specifications &
Operational Parameters
2.1
Scope
This section contains information pertinent to the functional and operational characteristics of the
the Model 1073A Distribution Amplifier. Topics presented in this section are: Operator Interface(s),
System Interface(s) and Physical Characteristics.
NOTE: Specifications are subject to change without notice.
2.2
Operator Interface
One front panel Status LED (green) indicates power on.
2.3
2.3.1
System Interface
Configuration
Three channels (A, B and C), each with one input and four outputs.
2.3.2
Operating Modes
Independent
Channels A, B and C independently driven by their individual inputs.
Common A
All outputs driven by channel A input.
Common B
Channel B and C outputs driven by Channel B input, Channel A outputs
driven by Channel A input.
4
Technical Specifications & Operational Parameters
2.3.3
Input Connectors
Three isolated 50-ohm BNC (one per channel), optional fiber optic (parallel to channel A BNC
input)
DC Coupled Opto-isolator (HCPL2601) + 562 ohms
Level
5 mA at 5 Volts, nominal
Polarity
Center conductor positive
Frequency
DC – 5 MHz
AC Coupled RF transformer; 50 ohms
Level
0 to +15 dBm (0.6 – 3.6 Vpp)
Frequency
100 kHz – 10 MHz
Fiber Type Option 01; 820 nm type-ST
Level
-25.4 to -9.2 dBm for +5 V, -40 dBm for 0 V
Frequency
DC - 5 MHz
Isolation 2000 Vrms, minimum, to common
2.3.4
Output Connectors
Four 50-ohm BNC per channel
Driver Each output, 74HC125 quad buffer; all four outputs connected in parallel
AC coupled
Level
5 Vpp, open-circuit, 2.5 Vpp (+12 dBm) into 50 ohms
Impedance
50 ohms + 0.1 µF capacitor, nominal
DC coupled
Level
5 Vpp, open circuit
Drive
±75 mA, maximum, per output
Impedance
15 ohms nominal
2.4 Physical Characteristics
2.4
2.4.1
Physical Characteristics
Dimensions
Instrument
2.4.2
430 mm W x 44 mm H x 260 mm D (16.9” x 1.7” x 10.05”)
Weight
Instrument
2.0 kg (4.5 lbs.), net
Shipping
3.6 kg (8 lbs.) includes manual and accessories
2.4.3
Power Requirements
Option 07
85 – 264 Vac, 47 – 440 Hz, or 110 – 270 Vdc, 3 VA typical. Including an
IEC-320, fused; mating cordset. Plug type specified as Options P1 through
P10.
Option 08
10 – 60 Vdc, 3 W typical. Using a 3-pole terminal strip with SWC for power
inlet.
Option 10
85 – 264 Vac, 47 – 440 Hz or 110 – 270 Vdc, 3 W typical. Using a 3-pole
terminal strip with SWC for power inlet.
2.4.4
Temperature
Operating
0 ◦ C to +50 ◦ C
Storage:
-40 ◦ C to +75 ◦ C.
2.4.5
5
Electro-Magnetic Interference (EMI)
Options 07 and 10 Power Input Modules comply with FCC 20780, Class A and VDE 0871/6.78,
Class A.
Options 08 and 10 Power Input Modules with SWC comply with ANSI/IEEE C37.90-1 and IEC
801-4.
6
Technical Specifications & Operational Parameters
Chapter 3
Physical Configuration
3.1
Instrument
3.1.1
Location Considerations
The Model 1073A is designed to operate in an environment having an ambient temperature range
of 0 ◦ C to +50 ◦ C (+32 ◦ F to +122 ◦ F). Operation is possible at temperatures of −20 ◦ C to +70 ◦ C,
typical. No external ventilation is necessary.
For best access to the 1073A, allow adequate clearance for rear-panel connections, especially in
rack-mounting situations.
3.1.2
Power Requirements
The standard AC input voltage range for the Model 1073A is 85 Vac to 264 Vac, 47 Hz to 440 Hz,
110 to 275 Vdc, or 10 to 60 Vdc. See Section 3.1.3.
3.1.3
Power Line Connection
The Model 1073A is equipped with a user specified Power Input Module. The modules available
are described in the following paragraphs.
Option 07, AC/DC Power Input Module (IEC-320 Inlet)
AC Operation
This power inlet module operates across an AC input voltage range of 85 – 264 Vac, 47 – 440 Hz.
The mating cordset provided is dependent upon the cordset option (P1 through P10) which was
specified at the time of purchase. For further information about available cord sets for specific
countries, see Table 1.1, or contact Arbiter Systems.
To connect the input power, first plug the end of the power cord having the mating IEC
connector into the power inlet module on the rear panel, then plug the other end into an appropriate
power outlet.
WARNING: For maximum safety and best performance, always connect the
input cord to a properly grounded power source.
8
Physical Configuration
DC Operation
For 110 – 270 Vdc operation, the DC voltage should be applied between the LINE and NEUTRAL
terminals of the power inlet module, without regard to polarity (the internal power supply will
accept either polarity). When viewing the power inlet module from the rear of the instrument,
the LINE connection is the one nearest the bottom, and the NEUTRAL is nearest the top. The
GROUND terminal is offset from the others, and protrudes slightly farther out of the connector.
WARNING: Connect input only to a properly grounded power source.
Option 08, DC Power Input Module
If Option 08 is ordered, the power module accepts ONLY DC input voltages from 10 – 60 Volts. The
standard IEC-320 inlet is replaced with a 3-pole terminal strip with input surge withstand capability
(SWC). The terminal strip is intended for connection to DC power sources. When connecting power
to a clock with Option 08, BE SURE TO OBSERVE CORRECT POLARITY, as the power
supply used with Option 08 will not accept reverse input polarity.
NOTE: Do not connect Option 08 module to any AC voltage source.
Option 10, AC/DC Power Input Module
AC Operation
This option provides a input power module which operates across an AC input voltage range of
85 – 264 Vac, 47 – 440 Hz. Line connection is via a 3-pole terminal strip which provides surge
withstand capability (SWC). This terminal strip is intended for connection to AC power sources,
although the unit is capable of operation from both AC and DC sources.
DC Operation
The input power module supplied with this option also accepts DC voltages from 110 – 270 Vdc
via the 3-pole terminal strip (with SWC).
Fuse Replacement, All Power Supply Options
The IEC-320 input power connector assembly includes a 1-Amp, 250-Volt fast-acting 5 x 20 mm
fuse. The fuse is contained in a small compartment with a snap-fit latch, which also has a compartment for a spare fuse.
CAUTION: For continued protection, replace the input fuse only with
one of the same type, voltage rating, and current rating as originally
supplied.
The fuse compartment in Option 07 is located directly adjacent to the input connector socket,
and can be opened by pulling both sides directly upward, or by gently prying with a small flatblade screwdriver. To replace the fuse, first disconnect the line cord from the power source and
3.2 Rack Mounting
9
then remove the cord from the rear-panel IEC connector. The in-circuit fuse is the innermost one;
inspect it to determine whether it is open. As required, replace with fuse in the outer compartment.
For instruments supplied with Option 08 or 10, the fuse is located in the fuse holder on the rear
panel near the power inlet terminal strip. The fuse is a 1-Amp, 250-Volt fast-acting (Option 10) or
time-delay (Option 08) 5 x 20 mm fuse. No spare fuse is provided for Options 08 or 10.
Replacement Fuses
Power Option
Arbiter P/N
Standard P/N
Option 07
FU0001816
F1AL250V
Option 08
FU0001419
T2AL250V
Option 10
FU0001816
F1AL250V
3.1.4
Rear-Panel Layout
The rear panel of the Model 1073A is arranged in the following manner, left to right (see Figure 3.1):
•
•
•
•
Five BNC type connectors, corresponding to channel C input and outputs.
Five BNC type connectors, corresponding to channel B input and outputs.
Five BNC type connectors, corresponding to channel A input and outputs.
One opening for an optional fiber-optic input connector (Option 01). If not used, it is covered
by a plastic hole plug.
• Option 07 provides an IEC-320 power inlet connector with built-in fuse holder. Options 08
or 10 provide a 3-pole-terminal strip and separate fuse holder.
OUTPUT OUTPUT OUTPUT OUTPUT
INPUT
OUTPUT OUTPUT OUTPUT OUTPUT
INPUT
OUTPUT OUTPUT OUTPUT OUTPUT
INPUT
110 – 250 Vdc
85 – 264 Vac
47 – 440 Hz
3W Typ.
G –
FUSE
CHANNEL C
J15
J14
J13
CHANNEL B
J12
J11
J10
J9
J8
+
1AF/250V
CHANNEL A
J7
J6
J5
J4
J3
J2
J1
U1, Opt. Fiber In
Figure 3.1: Model 1073A Rear Panel
3.2
Rack Mounting
To facilitate mounting the instrument in a standard 483 mm (19 inch) equipment rack, the 1073A
includes a pair of rack-mounting ears. To install the rack mounting ears:
1. Using a T-25 driver, remove the two screws on one side of the unit. Leave the cover in place.
2. Position one of the rack mounting ears on the side of the unit, so that the rack mounting
flange is at the front of the instrument and extends away from the front panel.
3. Replace the cover screws by routing them through the lower set of holes in the rack-mounting
ear, and back into the threaded holes in the instrument.
4. Repeat the above steps for the opposite rack-mounting ear.
10
Physical Configuration
3.3
Cover Removal
To gain access inside the Model 1073A and change any jumper position, the instrument cover must
be removed. Remove top cover as follows:
1. Disconnect the power cord.
2. Using a T-25 driver, remove the four screws securing the cover (and rack mount ears, if used).
Lift the cover off.
3.4
Jumper Configuration
The Model 1073A has a system of jumpers and selectable shunts to configure each channel for
either AC or DC signals, and to configure the overall distribution of signals. To help identify these
features, a brief indication of each jumper’s function is given on the PC board silk-screen, near the
jumper. For reference, see Figure 3.2 on page 14.
To optimize the distribution of signals, the Model 1073A has three separate channels with four
outputs dedicated to each input channel. The configuration of each channel is virtually identical,
except for selections which determine input bussing. Input bussing is the ability to drive multiple
channels from one input. For example, the input to Channel A can drive Channel A, B and C
outputs. Channel A input can also drive Channel A and C outputs, skipping Channel B. Bussing
also allows you to use Channel B input to drive Channel B and Channel C outputs, leaving Channel
A to be independent. Otherwise, Channels A, B and C may be driven independently from their
respective inputs. See Section 3.4.2 for more information on bussing.
3.4.1
AC/DC Coupling of Inputs
To select each input channel coupling use Table 3.1 below. For bussing of additional channels from
one input channel, see Section 3.4.2 below. For either AC or DC input coupling for Channel A,
use jumpers JMP1 and JMP2. For Channel B, use jumpers JMP7 and JMP8. For Channel C use
jumpers JMP14 and JMP15. Note that Channel A consists of the group of five BNC connectors
which are rightmost when facing the rear panel. Remember to correctly set both jumpers for each
input to function properly.
Channel
Both Jumpers
DC Coupling
AC Coupling
A
JMP1, JMP2
A, A
B, B
B
JMP7, JMP8
A, A
B, B
C
JMP14, JMP15
A, A
B, B
Table 3.1: Input Coupling Jumper List
AC coupling is normally used for time base signals, such as 5 or 10 MHz derived from a satellitecontrolled clock. These signals are generally square waves, or sine waves (with some limitations;
see below). DC coupling is normally used for signals such as unmodulated IRIG time codes, and
asymmetric pulse outputs such as 1PPS. DC coupling may also be used with square wave input
3.4 Jumper Configuration
11
signals up to 5 MHz, if the input level is 0 to 5 volts and CMOS-compatible. For AC-coupled
inputs, the nominal operating level of the input circuit is 0 to +15 dBm (0.6 to 5 Vpp).
3.4.2
Input Bussing
An input signal applied to Channel A, in addition to driving the four Channel A outputs, may also
drive the Channel B and/or Channel C outputs. Likewise, an input signal applied to Channel B
may also drive the Channel C outputs. For bussing, set channel jumpers according to the “Buss
Selected” column shown in Tables 3.2 and 3.3. Use “Independently Selected” column in these tables
to set each channel jumper so that each channel operates independently.
JMP8 Position
JMP9 Position
Independently Selected
Buss Selected
A
A
DC coupled
–
B
A
AC coupled
–
A or B
B
–
Channel A as Input
Table 3.2: Channel B Input Selection Guide
Table 3.2 indicates how to select Channel A signal as input to Channel B outputs; set jumper
JMP9 to the ‘B’ position. The positions of jumpers JMP7 and JMP8 have no effect on bussing
operation. As the table indicates, jumper JMP8 does not affect Channel A bussing selection.
JMP15 Position
JMP16 Position
Independently Selected
Buss Selected
A
A
DC coupled
–
B
A
AC coupled
–
A
B
–
Channel A as Input
B
B
–
Channel B as Input
Table 3.3: Channel C Input Selection Guide
Table 3.3 indicates how to select the Channel A signal as input to Channel B and C outputs;
set JMP15 to the ‘A’ position and JMP16 to the ‘B’ position. The position of JMP14 has no effect
on bussing operation. Leave jumper JMP9 in the ‘A’ position to bypass Channel B.
Table 3.3 also indicates how to select the Channel B signal as input Channel C outputs; set
JMP15 to the ‘B’ position and JMP16 to the ‘B’ position. The position of JMP14 has no effect on
bussing operation.
3.4.3
Input Characteristics
AC-coupled mode is intended for use with signal frequencies of 100 kHz and above. In AC-coupled
mode, the approximate input impedance of the Model 1073A is 100 ohms, isolating the input
transformer. AC-coupled inputs may be driven with sine or square waves having levels of 0 to +15
dBm, or 0.2 Vrms to 1.2 Vrms from a 50-ohm source. For a low-impedance source, use input levels
12
Physical Configuration
from 0.6 to 5 Vpp. DC bias levels of up to 25 volts are rejected by a series capacitor (1 microfarad)
and will have no effect on operation.
Lower signal levels may also work properly if the input has sufficient slew rate. The AC input
limiting amplifier has high gain, and will oscillate if no input is present, or if the applied signal
crosses too slowly through the transition level. To prevent this, apply 0 dBm at 100 kHz or above,
sine wave or square wave.
In DC-coupled mode, the input is a 562-ohm resistor in series with a 6N137 optocoupler LED,
with a 6.8 V Zener diode (1N4736A) in parallel with the input for protection against overvoltage,
overshoot and ringing, or reverse voltage. Drive the DC-coupled input with a CMOS-compatible,
0 to +5 volt signal. The input will draw approximately 5 mA when driven at 5 volts. DC-coupled
mode may be used with any signal up to 5 MHz.
Both AC and DC coupled inputs are isolated from the instrument chassis and from each other
with isolation of 2000 Vrms minimum.
3.4.4
AC/DC Coupling of Outputs
Each output BNC connector may be individually selected for AC or DC coupling. AC coupling is
normally used for time-base signals, such as 5 or 10 MHz. The output signal will be a leveled square
wave, even if the input signal is a sine wave (a limiting amplifier is used to control output level).
DC coupling is normally used for signals such as unmodulated IRIG time codes, and asymmetric
pulse outputs such as 1PPS. DC coupling may also be used with square wave signals, if signal levels
of 0 to 5 Volts (CMOS-compatible levels) are required.
To select DC coupling for an output, set the associated jumper to the ‘A’ position. For AC
coupling, set the jumper to the ‘B’ position. Table 3.4 on page 13 lists the correspondence between
each jumper and the corresponding output connector; however, each jumper is located adjacent to
the respective output connector.
3.4.5
Output Characteristics
Each output is driven by four drivers of a 74HC125-bus buffer in parallel. This gives each output
the capability of sourcing, or sinking, up to 75 mA. In DC-coupled mode, the driver has a 10-ohm
series resistor, which provides some current limiting in the event of a short circuit, reducing driver
power dissipation. The output impedance of the buffer itself is around 5 ohms at the rated current
levels of 0 to 75 mA, for a total source impedance of approximately 15 ohms. DC-coupled mode
may be used for any signal.
In AC-coupled mode, the driver has a 45-ohm resistor and 0.1 microfarad capacitor in series,
providing approximately 50 ohms source impedance to match 50-ohm coaxial cables. The driver
will deliver a signal level of +10 to +13 dBm, nominal, into a 50-ohm load. AC-coupled output
mode is recommended for use at 100 kHz or above.
3.5 Fiber Optic Input (Option 01)
13
Channel
Coupling Jumper
Output Connector
A
JMP3
J2
A
JMP4
J3
A
JMP5
J4
A
JMP6
J5
B
JMP10
J7
B
JMP11
J8
B
JMP12
J9
B
JMP13
J10
C
JMP17
J12
C
JMP18
J13
C
JMP19
J14
C
JMP20
J15
Table 3.4: Output Jumper List
3.5
Fiber Optic Input (Option 01)
When Option 01 is installed, the Model 1073A also has a fiber-optic receiver which is connected in
parallel with channel-A input, DC-coupled optocoupler’s output. To use the fiber-optic receiver,
connect an optical signal meeting the requirements listed in Section 3.5.1, and follow the instructions
above for a DC-coupled input on channel A. All of the same features and restrictions apply, including
an upper frequency limit of 5 MHz and the bussing features.
With Option 01 installed, the normal DC-coupled input may still be used as long as a fiber optic
signal is not connected. The signals from the optical input and the DC-coupled optocoupler are
wire-OR’ed. To ensure proper operation, and to protect the fiber input connector from damage,
make sure that the protective cover supplied with the optical receiver is installed whenever the
optical receiver is not being used.
3.5.1
Optical Input Characteristics
The optical input has a type-ST connector compatible with 820 nm, multimode fiber, such as 50/125
or 62.5/125 um. An optical power input of -25.4 to -9.2 dBm is required to generate a logical ‘1,’
i.e. +5 volts at a (DC-coupled) output. An optical input of -40 dBm or less will guarantee a logical
‘0.’ These characteristics are compatible with the multimode fiber outputs available for the Arbiter
Systems satellite-controlled clock products. The optical receiver is compatible with any signal up
to 5 MHz.
14
Physical Configuration
Figure 3.2: Model 1073A Main Board Jumper Locations
Chapter 4
Operation
4.1
Front Panel Controls and Indicators
The Model 1073A front panel is illustrated in Figure 4.1 and described in the following paragraphs.
Figure 4.1: Model 1073A Distribution Amplifier, Front Panel
4.1.1
LED Status Indicators
When illuminated, a single LED on the Model 1073A front panel indicates that power is applied.
4.1.2
Front Panel Line Switch (Option 04)
When Option 04 is installed, the Model 1073A is provided with a front-panel line switch. When
this option is not installed, a hole plug is mounted in this location.
4.2
Operator Control Functions
No operator control functions (other than the Option 04 line switch, if installed) are provided or
necessary. All configuration of the Model 1073A is performed with internal jumpers. See Section 3.4.
16
Operation
Appendix A
CE Mark Certification
A.1
Introduction
On the following pages contain the individual CE Mark Certifications for models covered in this
manual. This includes Model 1073A.
18
CE Mark Certification
Declaration of Conformity with European Union Directives
Date of Issue:
June 30, 2003
Directives:
89/336/EEC Electromagnetic Compatibility
73/23/ EEC Low Voltage Safety
Model Number(s):
1073A Distribution Amplifier
Manufacturer:
Arbiter Systems, Inc.
1324 Vendels Circle, Suite 121
Paso Robles, CA 93446 − USA
Harmonized
EN55011 Class A, Radiated and Conducted Emissions
Standard
EN50082-1 Generic Immunity, Part 1
Referenced:
Residential, Commercial and Light Industrial Environments
EN61010-1 Safety requirements of Electrical Equipment for
Measurement, Control and Laboratory Use.
Signed:
Signatory:
Bruce H. Roeder
This certificate declares that the described equipment conforms to the applicable requirements of
the directives on Electromagnetic Compatibility 89/339/EEC, Safety 73/23/EEC, and amendments
by 93/68/EEC adopted by the European Union.
Index
Appendix
A, 17
bussing
inputs, 11
CE mark certifications, 17
connectors
input, 4
output, 4
contact information, ii
copyright, v
coupling
inputs, 10
outputs, 12
cover removal, 10
fiber optic input
characteristics, 13
description, 13
fuse
replacement type, 9
replacing, 8
input characteristics, 11
jumper
Channel B, 11
Channel C, 11
drawing, 15
input coupling, 10
table, 12
jumpers, internal
configuring, 10
LED indicators, 15
Operating Modes, 3
Options, 2
01, fiber optic input, 2
04, ON/OFF switch, 2
07, power inlet module, 2, 5, 7
08, power inlet module, 2, 5, 8
10, power inlet module, 2, 5, 8
output characteristics, 12
physical characteristics, 5
power inlet supplies, 1
HI AC/DC, 1
LO DC ONLY, 1
standard, 1
power switch, 15
rack mounting, 9
rack-mount ears, 1
rear-panel drawing, 9
rubber feet, self adhesive, 1
title page, v
warranty, iii